After 4 weeks, the fracture line appears somewhat widened. This corresponds to marginal resorption zones along the fracture. Therefore, the diagnosis of an expanding fracture (e.g. 2nd to a growing arachnoidal cyst) cannot be solely made by the evidence of a slight widening of the fracture line! A bony callus formation is rarely seen in skull fractures.

Radiological findings:

X-Ray 1: Left parietal, a soft linear opacity is seen, without branching and without marginal sclerosis. (Accessory sutures are not present here)